The cell’s DNA is tightly packed and coiled in a bacterial cell before binary fission. The binary fission process in bacteria occurs sequentially as follows: There are several bacterial proteins that are functionally similar to eukaryotic protein to help mitotic division. This similarity between binary fission and mitosis made the researchers think that mitosis might have probably evolved from binary fission as the prokaryotes evolved before eukaryotes.Īlso, some protists were identified to show cell division that seems in-between mitosis and binary fission. Some mitochondria (not animals) and all chloroplasts in plants are derived from bacterial endosymbiosis (endosymbiotic theory hypothesized that prokaryotes are evolved to become mitochondria) are found to use the FtsZ mechanism of Archaea. Mitochondrial fission is crucial to regulate the cell’s metabolism. The mitochondrial fission occurs often within the cell even when the cell is not actively dividing through mitosis. Those prokaryotes and eukaryotes that lacked cell wall had a similar type of mitosis of mycoplasma.Ī Scientist named, Heath was the first researcher to propose and elaborate on the evolution of mitosis in mycoplasma and validated that in animal cells in 1974.Īlthough, binary fission takes place in prokaryotes as an asexual reproduction this type of cell division is also seen in cell division by some organelles in eukaryotes such as mitochondria.
The primitive eukaryotic tubulin and FtsZ mechanism of bacterial cell division were also found to exist in mycoplasma. The chromosome segregation mechanism of mycoplasma is the basis for the evolution of early-stage mitosis. The mechanism of segregation and the formation of several separate genetic units are the driving force for mitotic evolution in eukaryotes.
The genome duplication with end-to-end annealing resulted in separate and small chromosomes which are the known characteristic feature of primitive eukaryotes. The evolution of mitosis is back beyond the discovery of bacteria and reaches the most primitive, mycoplasma.īacteria derived its chromosomes from the mycoplasma-like organisms is the theory that revolved around the evolution of bacteria.
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